type 678 – running instructions · type 678 – running instructions technical support line: ......

Type 678 – Running Instructions

Technical Support Line: Phone: +1.780.440.4440 | Toll Free: +1.866.640.4440 | USA: +1.877.246.2612 | www.rubicon-oilfield.com Rev 02-2017 Dec

1. Equipment

Top-Co 678 Two Stage Cementing Collars are supplied with:

1. First stage flexible Shut-Off plug, 2. Rubber first stage Shut-Off baffle 3. Second stage closing plug.

Certain applications will require Landing Collars in place of Rubber First Stage Shut-off Baffle.

Plugs and Trip Dart to be run in order shown from left to right.

Note: Stage tool drill-out materials are all PDC drillable, rubber and phenolic plastic



2. Sequence of Operation

Step 1: Stage Collar in Running In and First Stage Cementing Position. First Stage Shut- Off Plug will pass through Stage Cementing Collar while displacing first stage cement, landing on Baffle Plate located in Float Collar.

Step 2H: Hydraulic Opening - Opening sleeve shifted down after opening through application of pressure, allowing second stage cement to be displaced through ports. Step 2M: Mechanical Opening (Contingency) - Opening Dart landed in Stage Cementing Collar. Opening Sleeve shifted to the open position allowing second stage cement to be displaced through ports.

Step 3: Second Stage Closing Displacement Plug landed in Stage Cementing Collar. Application of pressure will close the Stage Collar Ports. Two stage cement job complete.

Step 1 Step 2 Step 3



2. Inspection

• Inspect Stage Collar and auxiliary equipment upon arrival at location.

• Check Stage Collar for dents, damaged threads, etc.

• If present, remove all plastic port plugs from the tool OD.

• Check inside of stage collar for any foreign debris; dirt, cuttings,

etc…

• Check Opening Dart and Closing Plug to verify that they will seat properly in Stage Tool.

• Ascertain that the First Stage Flexible Plug will seat properly on the

baffle plate.

• Verify that the cementing head contains no foreign plugs or objects.

• If First Stage Flexible Shut-Off Plug and Second Stage Closing Plug are to be pre-load in cementing head, verify that the Plug Release Mechanism is operable, that the Retaining Mechanism is sufficient to retain the First Stage Flexible Shut-Off Plug and the Second Stage Closing Plug.

• Verify that the nose of the second stage closing plug with pass

through the ID of the cement head or any joints or tools between the cement head and the casing

• If for some reason it is felt that the Cementing Head can not

properly retain the First Stage Flexible Shut-Off Plug, it will have to be loaded by hand.



3. Rubber Shut-Off Baffle Installation

Before running casing, install Rubber Shut-Off Baffle on top of Float Collar with tapered side up.

a. For API Buttress and 8RD connections, the rubber baffle is press fit into

the box end of the float. The pin of the casing will hold the baffle plate in place once the float is installed on the casing. Note: thread lock can be used to hold the baffle in place if desired (see below)

b. For premium connections, the First Stage Shut-Off Baffle should be

installed by mixing up a can of thread lock and placing thread lock on the top exposed surface of the Float Collar. (It is recommended that a cloth be placed in the circulation port of the Float Collar during this operation to prevent thread lock from dropping down into the valve). Once the thread lock has been placed on the cement, place the baffle plate down to the bottom of the threads in the float collar locating the baffle plate on top of the cement. Allow the thread lock to cure until such time as the baffle plate is held in place (usually about 60 minutes).

Rubber baffle plate



The Rubber Shut-off Baffle should not be used on float equipment with tapered surfaces, such as Ball Activated Differential or Auto Fill Float Equipment.

It is recommended that both a Float Shoe and a Float Collar be run when two-stage cementing. This gives maximum assurance that the first stage cement is retained in the desired location upon completion of displacement of first stage cement.

4. Installing and running in stage collar

1. Run casing and install Top-Co 678 Stage Cementing Collar at desired depth. Thread lock must be applied to the Stage Collar pin.

Do not use casing or any other type of tong, on any part of the Stage Collar body during installation.

Body – NO Tongs Permitted

The reduced diameters at the box and pin end of the Stage Tool can be tonged for make up purposes.



2. The stage collar can be installed using one of 2 methods:

Method A

a. Screw the stage collar onto the casing string and torque as per thread requirements; DO NOT TONG ON STAGE TOOL BODY (Reference EB- 38)

b. Insert the pin from the next casing joint into the box of the stage

collar and torque as per the thread requirement

c. If thread lock is being used ALWAYS apply to the pin not the box

Method B

a. Partially thread the stage collar pin onto the casing string

b. Position pin of next casing joint in box end of stage collar

c. Apply torque to casing above stage collar to tighten joints

d. Torque casing as per thread requirements

e. Note: DO NOT TONG ON STAGE TOOL BODY (Reference EB- 38)

f. If thread lock is being used ALWAYS apply to the pin not the

box

3. Run casing to total depth.

4. Circulate to condition the hole and the drilling fluid.



5. Mix and pump First Stage Cement into casing.

6. Launch from Cementing Head First Stage Flexible Shut-off plug on top of First Stage Cement. If First Stage Flexible Shut-off Plug is loaded in Cementing Head, do assure that the plug release mechanism is sufficient to retain the First Stage Flexible Shut-off Plug. If it is felt that the Cementing Head’s Plug Release Mechanism is insufficient, the Plug should be loaded by hand to avoid premature releasing of the First Stage Flexible Shut-off Plug.

7. Start pumping calculated amount of fluid to move first stage flexible

shut-off plug to the float collar. It is highly recommended that the pumping rate be slowed to 0.5 cu.meter/minute (3 bpm), as the flexible plug is pumped through the Stage Collar (Do not exceed 0.8 cu.meter/minute or 5 bpm when pumping through stage collar). After the plug passes through the Stage Collar, resume the regular pump rate and pump the total calculated amount of displacement fluid necessary to land the First Stage Flexible Shut-off Plug at the Rubber Shut-off Baffle.

8. Pressure 3.447 MPA (500 psi) over circulating pressure to seat the

plug in baffle plate.

9. Release the pump pressure against the First Stage Flexible Shut-off Plug and check the Float Shoe / Float Collar for flow back. Record the amount of fluid bled back to the pumping unit. This information may be helpful later in determining if the opening dart is in place.

10. 5. Hydraulic Opening of Stage Collar

1. With the Float Shoe / Float Collar holding back pressure, pressure float collar.

If an external casing packer is being used, increase pressure to inflate and set the external casing packer.



2. Apply pressure to casing until Stage Tool hydraulically opens. Opening pressure to be set before running as per Section 7.0 and Table 1 (Opening Pressure Hydraulic).

3. When Stage Collar opens, circulation can be established to condition

the hole. After conditioning of the hole, circulation should be maintained at a lesser rate until Second Stage Cement is ready to be pumped. This will prevent solids in the drilling fluid from settling in the stage tool and preventing proper shifting of closing sleeve.

4. Mix second stage and pump into casing.

5. After second stage cement slurry is pumped, release second stage

closing plug from plug loading head. (Or release manually if plug loading head is not used). Verify that the plug has left the head. Cement lines may or may not be washed out before dropping the plug.

6. Maximum rate of pumping cement through the stage tool should be 5

– 8 bbl. /min. Pump the calculated amount of fluid to seat Second Closing Plug in the Stage Collar. As the closing plug approaches the stage collar, for the last 5 barrels slow the pump rate to 2 barrels (.32 cu. Meter) per minute for casing size 10 ¾”/173mm and higher, and to 1 barrel (.16 cu. Meter) per minute for casing size 9 5/8” and smaller. Monitor pressure and check for bumping of the plug.

7. When closing plug seats in Stage Collar, pressure as indicated in

Table 1 (Closing Pressure) above circulating pressure to close Stage Collar.

8. Hold pressure for 5-10 minutes to assure Stage Collar has shifted to

closed position.

9. Bleed off pressure; check for flow back to make sure the Stage Collar is locked in the closed position. If excessive and continued flow back is observed, gradually increase pressure by 500 psi above the maximum closing pressure on table 1. Increase pressure again by



another 500 psi and hold for 10 minutes. Pressure should be increased for a third time by another 500 psi and held for 10 minutes then bleed off.

JOB IS NOW COMPLETE

Note: These are the primary instructions recommended for use when operating the Type 678 Stage Collar. In the event that unforeseen circumstances arise; due to wellbore conditions or other factors; it may be necessary to deviate from these instructions.

6. Contingency Mechanical Opening of Stage Collar

1. With the Float Shoe / Float Collar holding back pressure, open cementing head and drop the plastic second stage opening trip dart.

Important: Allow time for trip dart to free fall to Stage Collar. If wellbore inclination is greater than 25º, the tool cannot be operated mechanically (dart does not free fall)

Normal free fall rate would approximately be 300m per 5 minutes or 200 feet per minute.

Mud weight and hole deviation may alter free fall time.

2. When Opening Trip Dart is seated in the Stage Collar, pressure up as

indicated in Table 1. (Opening Pressure Mechanical) to open the Stage Collar.

3. When Stage Collar opens, circulation can be established to condition

the hole. After conditioning of the hole, circulation should be maintained at a lesser rate until Second Stage Cement is ready to be pumped. This will prevent solids in the drilling fluid from settling in the stage tool and preventing proper shifting of closing sleeve.



4. Mix second stage and pump into casing.

5. After second stage cement slurry is pumped, release second stage closing plug from plug loading head. (Or release manually if plug loading head is not used). Verify that the plug has left the head. Cement lines may or may not be washed out before dropping the plug.

6. Maximum rate of pumping cement through the stage tool should be

5 – 8 bbl. /min. Pump the calculated amount of fluid to seat Second Closing Plug in the Stage Collar. As the closing plug approaches the stage collar, for the last 5 barrels slow the pump rate to 2 barrels (.32 cu. Meter) per minute for casing size 10 ¾”/173mm and higher, and to 1 barrel (.16 cu. Meter) per minute for casing size 9 5/8” and smaller. Monitor pressure and check for bumping of the plug.

7. When closing plug seats in Stage Collar, pressure as indicated in

Table 1 (Closing Pressure) above circulating pressure to close Stage Collar.

8. Hold pressure for 5-10 minutes to assure Stage Collar has shifted to

closed position.

9. Bleed off pressure; check for flow back to make sure the Stage Collar is locked in the closed position. If excessive and continued flow back is observed, gradually increase pressure by 500 psi above the maximum closing pressure on table 1. Increase pressure again by another 500 psi and hold for 10 minutes. Pressure should be increased for a third time by another 500 psi and held for 10 minutes then bleed off.

JOB IS NOW COMPLETE




7. Using Weight on Bit (WOB) to Close

1. Tag the closing plug with BHA 2. Mark the drill string when the closing plug has been tagged. 3. Apply the minimum weight to close the tool. Increase the weight

until movement of the mark is seen or up to the maximum closing weight. Refer to Table 1 for closing loads. Approximately 3-1/8” movement indicates the tool is closed.

4. If the tool has not shifted when the maximum weight is applied and held for 1 minute, increase the load by 15%.

5. Again, approximately 3-1/8” confirms the inner sleeves have shifted to the close position.

JOB IS NOW COMPLETE


8. Setting Hydraulic Opening Pressure

1. The opening pressure of the stage tool is controlled by the number of shear screws (Figure 1) used on the body (see Table 1). The standard factory setting is for maximum opening pressure as listed in Table 1.

Figure 1: Brass Shear Screw

2. All shear screws removed need to be replaced with plastic Blank Screws to prevent debris from entering the stage tool body; see



Shear Screw

Guide Screw

Figure 2.

Figure 2: Blank Screw

3. Note: The shear screws are not to be confused with the guide screws

which can be identified by 2 holes drilled into the head. Do not remove or replace the guide screws.



4. The opening pressure shear screws are the bottom set of screws (from the pin end); see Figure 3.

Figure 3: Opening & Closing Shear screw positions

NOTE: DO NOT REMOVE OR ADJUST THE CLOSING SHEAR SCREWS (THREAD-LOK)

5. Determine the required hydraulic opening pressure and remove shear

screws until required opening pressure is obtained. When removing screws, use an alternating pattern (i.e. 1st, 3rd, 5th around the tool) *DO NOT REMOVE MORE THAN 6 OF THE 8 SHEAR SCREWS

6. The shear screws have a right hand thread. Using a slotted screw

driver, they are removed by turning them counter clockwise (Figure 4).

Opening Shear screws

Closing Shear Screws



Figure 4: Removing Shear Screws

7. Care must be taken to ensure that, while the screws are removed, no foreign objects land in shear screw holes.



8. Install the blank screws using a slotted screw driver, rotating them clockwise (Figure 5)

Figure 5. Installing Blank Screws

9. The blank screws should be tightened until the screw bottoms out.



10. If shear screws are being installed they should be peened to the stage tool body to lock them into place. The shear screws are peened with a hammer and punch. The punch should be placed at the joint between the Stage Collar body and the shear screw, and given a sharp hit with the hammer, the hit being hard enough to indent both body and shear screw. Only the shear screws need to be peened, not the blanks (Figure 6).

11. This is an optional procedure to peen the shear pins for the T678. It is

only used if concerns about the screws backing off.

Figure 6: Peening the screws (Optional)

Note: Unless otherwise specified, all Type 678 Stage Collars are shipped with a full set of shear screws in place.



Table 1: Operating Specifications

L80 P-110 STAGE TOOL BODY

SIZE

CASING WEIGHT (lbs./ft.)

OPENING PRESSURE - HYDRAULIC (psi)

OPENING PRESSURE - MECHANICAL (psi)

CLOSING PRESSURE (psi)

CLOSING FORCE (lbs)

MAXIMUM BURST

PRESSURE (psi)

MAXIMUM COLLAPSE PRESSURE

(psi)

MAXIMUM BURST

PRESSURE (psi)


(psi)

LOAD BELOW

THE TOOL (lbs.)

MAX TEMP

RATING (◦F)

CEMENTING PORTS

TOTAL CEMENTING PORTS AREA

(sq.in)

OD (in)

MAX

DRILLOUT ID (in)

OPENING SEAT ID (in)

CLOSING SEAT ID (in) Screws

8 7 6 5 4

5 1/2 14 - 15.5

3,600 3,150 2,700 2,250 1,800 500 - 800 700 - 1,000 15,240 - 17,160 7,813 6,417 11,033 8,192 160,000 400 8 X Dia. 0.875" 4.81 6.625

4.897 3.625 4.000 17 - 20 4.835

6 5/8 20 - 24

3,600 3,150 2,700 2,250 1,800 600 - 900 900 - 1,200 27,400 - 29,400 6,431 3,992 8,842 4,587 190,000 400 8 X Dia. 0.875"

4.81 8.000 5.934

4.375 5.000 28 - 32 5.675

7 20 - 26

3,600 3,150 2,700 2,250 1,800 500 - 800 800 - 1,100 27,400 - 29,400 6,236 3,650 8,575 4,271 200,000 400 8 X Dia. 0.875" 4.81 8.250

6.351 4.625 5.250 29 - 32 6.161

8 5/8 28 - 32 3,600 3,150 2,700 2,250 1,800 400 - 700 600 - 900 33,368 - 35,368 5,977 3,351 8,218 3,850 275,000 400 10 X Dia.

0.875" 6.01 10.125 7.902 6.000 6.760

9 5/8 32.3 - 36

3,600 3,150 2,700 2,250 1,800 400 - 700 500 - 800 38,600 - 40,600 5,440 2,738 7,480 2,978 300,000 400 10 X Dia.

0.875" 6.01 11.125 8.855

6.750 7.760 40 - 53.5 8.689 NOTE: 1. CASING WEIGHT RANGES APPLY TO API 8RD AND BUTTRESS CONNECTIONS ONLY

L80 P-110 STAGE TOOL BODY

SIZE

CASING WEIGHT

(kg/m)

OPENING PRESSURE - HYDRAULIC (psi) OPENING PRESSURE

- MECHANICAL (Mpa)

CLOSING PRESSURE

(Mpa)

CLOSING FORCE (kN)

MAXIMUM BURST

PRESSURE (Mpa)


(Mpa)

MAXIMUM BURST

PRESSURE (Mpa)


(Mpa)

LOAD BELOW

THE TOOL (kN)

MAX TEMP

RATING (◦C)

CEMENTING

PORTS

TOTAL CEMENTING PORTS AREA

(sq.cm)

OD (mm)

MAX

DRILLOUT ID (mm)

OPENING SEAT ID

(mm)

CLOSING SEAT ID

(mm) Screws

8 7 6 5 4

139.70 20.83 - 23.07

24.82 21.72 18.62 15.51 12.41 3.45 - 5.52 4.83 - 6.90 67.79 - 76.33 53.87 44.25 76.07 56.48 712 204 8 X Dia. 22 mm

31.0 168.28 124.38

92.08 101.60 25.30 - 29.76 122.81

168.28 29.76 - 35.72

24.82 21.72 18.62 15.51 12.41 4.14 - 6.21 6.21 - 8.27 121.88 - 130.78 44.34 27.52 60.97 31.63 845 204 8 X Dia. 22 mm 31.0 203.20

150.72 111.13 127.00 41.67 - 47.62 144.15

177.80 29.76 - 38.69

24.82 21.72 18.62 15.51 12.41 3.45 - 5.52 5.52 - 7.58 121.88 - 130.78 43.00 25.17 59.12 29.45 890 204 8 X Dia. 22 mm

31.0 209.55 161.32

117.48 133.35 43.16 - 47.62 156.49

219.08 41.67 - 47.62 24.82 21.72 18.62 15.51 12.41 2.76 - 4.83 4.14 - 6.21 148.43 - 157.32 41.21 23.11 56.66 26.55 1,223 204 10 X Dia. 22 mm 38.8 257.18 200.71 152.40 171.70

244.48 48.07 - 53.57

24.82 21.72 18.62 15.51 12.41 2.76 - 4.83 3.45 - 5.52 171.70 - 180.60 37.51 18.88 51.57 20.53 1,334 204 10 X Dia. 22 mm 38.8 282.58

224.92 171.45 197.10 59.53 - 79.62 220.70

NOTE: 1. CASING WEIGHT RANGES APPLY TO API 8RD AND BUTTRESS CONNECTIONS ONLY



Table 2: Drillout Torque

Stage Collar Drill Out Max Torque Limit Table

Tool Size

Torque (ft-lbs)

Torque (Nm)

4" 17,586 23,843 4 1/2" 19,544 26,498

5" 21,503 29,154 5 1/2" 22,971 31,145 5 3/4" 24,401 33,083 6 5/8" 28,357 38,447

7" 29,336 39,774 7 5/8" 32,273 43,757 8 5/8" 36,190 49,067 9 5/8" 40,107 54,377 10 3/4" 44,023 59,688 12 3/4" 52,836 71,636 13 3/8" 53,815 72,963

16" 64,096 86,903

type 678 – running instructions · type 678 – running instructions technical support line: ......

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